5 V bus transceiver — what the 74HCT family buys you
The SN74HCT245DBR: The 20-SSOP package (5.30 mm body width) suits density-constrained boards that still need a full 8-bit bus interface.
6 mA drive — sizing the load budget
Each output pin sources or sinks 6 mA (typical), which is adequate for driving a single TTL load or a bank of CMOS inputs. If your bus fans out to more than one receiver per line, or if you are driving a long backplane trace, the 6 mA limit will force a buffer or a stronger driver. Compare with the 32 mA drive of the SN74LVTH16245ADGVR if your load budget is tighter.